From:
Will Delta Make Me Sick Again?
Researchers are investigating how likely people are to get Covid-19 a second time. At present, we know that reinfection can happen, as can so-called breakthrough infections in people who are fully vaccinated.
More research on delta is needed, but a new study Thursday suggested the variant is able to evade natural antibodies made in our bodies after infection. Looking at blood drawn from 162 patients, scientists found that while antibodies from people infected with Sars-CoV-2 didn’t neutralize delta very well, after just one vaccine dose, antibodies from people with a previous infection were able to neutralize all four strains of the virus tested.
Antibodies from people who had only one dose of a vaccine and hadn’t previously been infected with the virus didn’t fare as well. Antibodies from people who were fully vaccinated but hadn’t had Covid performed well, confirming other evidence that the vaccines are extremely effective against delta. The early evidence suggests that if you’re unvaccinated—whether you’ve had Covid or not—you are more vulnerable to delta infection. Once again: vaccination for the win.